CVE-2026-100793: Vulnerability in Mozilla Firefox
JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 157.
AI Analysis
Technical Summary
CVE-2026-100793 describes a JIT miscompilation vulnerability in the JavaScript Engine component of Mozilla Firefox. The flaw could cause incorrect code generation during JIT compilation, potentially leading to security issues. Mozilla fixed this vulnerability in Firefox 157 as part of a broader security update addressing multiple high-impact bugs. The vendor advisory explicitly lists this CVE with high impact and confirms the fix in Firefox 157.
Potential Impact
The vulnerability has a high impact rating according to Mozilla's advisory. It affects the JavaScript Engine's JIT compiler, which could lead to incorrect execution of JavaScript code. While no active exploitation in the wild is reported, the nature of the flaw suggests potential risks if exploited. The fix in Firefox 157 mitigates these risks.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox version 157. Users and administrators should update to Firefox 157 or later to remediate this issue. No additional mitigation steps are indicated or required beyond applying the official update.
CVE-2026-100793: Vulnerability in Mozilla Firefox
Description
JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 157.
Affected software
Mozilla
Firefox
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-100793 describes a JIT miscompilation vulnerability in the JavaScript Engine component of Mozilla Firefox. The flaw could cause incorrect code generation during JIT compilation, potentially leading to security issues. Mozilla fixed this vulnerability in Firefox 157 as part of a broader security update addressing multiple high-impact bugs. The vendor advisory explicitly lists this CVE with high impact and confirms the fix in Firefox 157.
Potential Impact
The vulnerability has a high impact rating according to Mozilla's advisory. It affects the JavaScript Engine's JIT compiler, which could lead to incorrect execution of JavaScript code. While no active exploitation in the wild is reported, the nature of the flaw suggests potential risks if exploited. The fix in Firefox 157 mitigates these risks.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox version 157. Users and administrators should update to Firefox 157 or later to remediate this issue. No additional mitigation steps are indicated or required beyond applying the official update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-26T19:17:25.865Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","vendor":"Mozilla"}]
Threat ID: 6abbb3f1f7a7c54106640991
Added to database: 09/29/2026, 12:49:53 UTC
Last enriched: 09/29/2026, 13:18:26 UTC
Last updated: 09/29/2026, 18:20:13 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.